12V to 5V Mobile Phone charger circuit (SMPS type)

The Voltage regulation Hero LM7805 will not works as we expected here, it will not provide enough juice(current) to charge cellphone's battery, especially more that 1500mah battery, So we need more current that provides enough juice to cellphone.

Here we are using LM2596 (Texas instruments) this provides 3A switch mode power supply. That is more than enough to charge 2 cellphones, Don't worry if you charge 1 cellphone, phone takes only max of 1A. It is the best/fast charging circuit i ever experimented.

Then here we go

Schematic

Components:

• IC1:LM2596
• D1: 1N5824 (schotty)
• L1: 33uH (coil & core type).
• C1:680uf 25V
• C2: 220uF 16V (different in schematic)
• R1,R2:100K
• R3: 470 Ohm.
• LED
• USB connector*

Project files and PCB:

Eagle Project file: DOWNLOAD

Reference: http://www.ti.com/lit/ds/symlink/lm2596.pdf
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